183 
MOLLUSCOIDA. 
the points of resemblance between the Brachiopoda and the 
Articulata, principally the Annelides. The caecal prolongations 
of the mantle in Terebratula, the polygonal cells in the «hell of 
the young Discina, find analogies among the Crustacea. The 
substance of the shell of Discina appears by chemical experiments 
to be chitinous. The setae or bristles of the Brachiopods are 
secreted by follicles and surrounded by muscular fibres, like 
those of the Annelides, and are also of identical structure with 
them. In the early stages of Discina these bristles are large 
and are moved freely by the animal, as in many worms and 
some young Polyzoa. The lophophore of the Brachiopods is 
compared to the arm-like supports of the gills in some tubi- 
colous Annelids, as lobelia ^ and the mantle to the cephalic 
collar. The soft folds or lamellae of the internal surface of the 
mantle, the existence of which is proved by Morse, are compared 
to similar features in the Balanidae. The blood of Lingula 
is red as in some Annelides. The peculiar oviducts, with their 
trumpet-shaped openings, are quite unlike those of any mollusk, 
but bear close resemblance to those of many worms. He comes 
to the conclusion that the Brachiopoda should be removed from 
the Mollusca and placed within the Articulata among the 
Annelides, forming a highly cephalized division of that class. 
P, Bost. Soc. June 1, 1870 j abstracts in Am. J. Sc. 1. pp. 100- 
104, and Ann. N. H. (4) pp. 267-270. 
Dall, W. H., publishing a revision of the genera and subge- 
nera of the Terebratulidae and Lingulidae, Am. Journ. Conch, vi. 
pp. 87-168, opposes this removal, pp. 87-95. 
TerehratuUna septentrionalia (Ooutlioiiy) kept distinct from tbe European 
caput-aerpentia (L.). Gould, Invert. Mass. 2nd edit. p. 208. 
Terehratella caurina, Gould, from Puget Sound, Dull, 1. c. p. 139, pi. 0. 
figs. 1-3. — 2’., sp. (an aujfuaa, Beove P), ibid. p. 122, pi. 8. fig. 4. 
LaqueuSf new subgenus of Terehratella. The reflected portion of the loop 
attached by slender processes on each side to the hamal processes at or near 
the points where the two septal processes branch off to the septum. Fora- 
men complete. L. calif ornicuSy Koch, Dall, 1. c. p. 123, pi. 8. figs. 9, 10; and 
Z. suffusus, sp. n. ?, 1. c. p. 123, pi. 7. fig. 9 A. 
Terehratella, subgenus lameniay King; I. sanguinea (Chemn.), Dall, l.c. 
p. 127, pi. 8. fig. 13. 
Magas patagonica, Gould, Dall, ibid. p. 133, pi. 6. figs. 11, 12, horn Orange 
Harbour, Patagonia. 
Magasella, new subgenus of Magas. The reflected portions of the apo- 
physes united, forming a loop. Magasella Jlexuosa (King) = magellanica 
(Reeve); M. lcevis, =malvincB (Orb.) P, both from Orange Harbour, 
Patagonia; M. spitzhergensis (Davids.), cumingi (Davids.), and crenulata 
(Sow.), Dall, 1. c. pp. 135-138 ; leevis figured, pi. 6. figs. 9, 10, and 13. 
Megerlia. Tlatydia damdaoni, Deslongchamps, belongs to the genus Me- 
gerlia, and is probably an abnormal form of M. truncata. Jeflreys, Ann. N. H. 
(4) vi. p. 467. 
